What Is The Sum Of 1+2+3+4...+n?
1+2=3 , 1+2+3=6 ,1+2+3+4=10, 1+2+3+4+5=15... we can continue like this. How can we calculate 1+2+3+4+....+n if n is an integer? Here is the answer
we can say that the sum of 1+2+3+4+.....+n equals to an integer like a
1+2+3+4+....+n= a [